The goal of this PhD project was to study the genetic architecture of pear resistance to two of its most significant diseases and pests, fire blight and psylla, which cause severe yield losses in all the main pear production regions worldwide. The development of new pear varieties with resistance against these two biotic stresses is of major interest for Integrated Pest Management. This project was designed in a joint collaboration among Fondazione Edmund Mach (Italy), Institut de Recherches en Horticulture et Semences (France) and Plant & Food Research (NewZealand). The interspecific pear F1 progeny PEAR3 x ‘Moonglow’ was developed with the purpose of cumulating resistances to fire blight and psylla deriving from Asian and European pear cultivars. Single nucleotide polymorphism (SNP) and simple sequence repeat (SSR)-based genetic maps were built for PEAR3 and ‘Moonglow’. Quantitative Trait Loci (QTLs) were detected for the resistances, demonstrating their polygenic nature. Marker-assisted selection (MAS) can now be applied for these two traits. Furthermore, the segregating population exhibited genetic incompatibilities, and the genomic regions associated with hybrid necrosis were mapped for the first time in pear. Development of molecular markers linked to the lethal genes should allow breeders to avoid crosses leading to incompatible combinations that could affect the expression of important agronomic traits co-segregating with these genes

Montanari, Sara (2015-07-03). Identification and mapping of genomic regions controlling fire blight and psylla resistance and hybrid necrosis in pear. (Doctoral Thesis). Université Nantes Angers Le Mans, a.y. 2014/2015, Biologie des organismes; Biotechnologies animales, végétales et microbiennes. Biologie cellulaire et moléculaire végétale, GMPF. handle: http://hdl.handle.net/10449/26437

Identification and mapping of genomic regions controlling fire blight and psylla resistance and hybrid necrosis in pear

Montanari, Sara
2015-07-03

Abstract

The goal of this PhD project was to study the genetic architecture of pear resistance to two of its most significant diseases and pests, fire blight and psylla, which cause severe yield losses in all the main pear production regions worldwide. The development of new pear varieties with resistance against these two biotic stresses is of major interest for Integrated Pest Management. This project was designed in a joint collaboration among Fondazione Edmund Mach (Italy), Institut de Recherches en Horticulture et Semences (France) and Plant & Food Research (NewZealand). The interspecific pear F1 progeny PEAR3 x ‘Moonglow’ was developed with the purpose of cumulating resistances to fire blight and psylla deriving from Asian and European pear cultivars. Single nucleotide polymorphism (SNP) and simple sequence repeat (SSR)-based genetic maps were built for PEAR3 and ‘Moonglow’. Quantitative Trait Loci (QTLs) were detected for the resistances, demonstrating their polygenic nature. Marker-assisted selection (MAS) can now be applied for these two traits. Furthermore, the segregating population exhibited genetic incompatibilities, and the genomic regions associated with hybrid necrosis were mapped for the first time in pear. Development of molecular markers linked to the lethal genes should allow breeders to avoid crosses leading to incompatible combinations that could affect the expression of important agronomic traits co-segregating with these genes
Velasco, Riccardo
Pyrus x bretschneideri
Pyrus communis
Genetic mapping
QTL detection
Cacopsylla pyri
Erwinia amylovora
Lethal genes
Genetic incompatibility.
Settore BIO/11 - BIOLOGIA MOLECOLARE
3-lug-2015
2014/2015
Biologie des organismes; Biotechnologies animales, végétales et microbiennes. Biologie cellulaire et moléculaire végétale
GMPF
Montanari, Sara (2015-07-03). Identification and mapping of genomic regions controlling fire blight and psylla resistance and hybrid necrosis in pear. (Doctoral Thesis). Université Nantes Angers Le Mans, a.y. 2014/2015, Biologie des organismes; Biotechnologies animales, végétales et microbiennes. Biologie cellulaire et moléculaire végétale, GMPF. handle: http://hdl.handle.net/10449/26437
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